Mercurial > dropbear
comparison libtommath/bn_mp_read_unsigned_bin.c @ 389:5ff8218bcee9
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 03:14:55 +0000 |
parents | eed26cff980b |
children | 60fc6476e044 |
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388:fb54020f78e1 | 389:5ff8218bcee9 |
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1 #include <tommath.h> | |
2 #ifdef BN_MP_READ_UNSIGNED_BIN_C | |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis | |
4 * | |
5 * LibTomMath is a library that provides multiple-precision | |
6 * integer arithmetic as well as number theoretic functionality. | |
7 * | |
8 * The library was designed directly after the MPI library by | |
9 * Michael Fromberger but has been written from scratch with | |
10 * additional optimizations in place. | |
11 * | |
12 * The library is free for all purposes without any express | |
13 * guarantee it works. | |
14 * | |
15 * Tom St Denis, [email protected], http://math.libtomcrypt.com | |
16 */ | |
17 | |
18 /* reads a unsigned char array, assumes the msb is stored first [big endian] */ | |
19 int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c) | |
20 { | |
21 int res; | |
22 | |
23 /* make sure there are at least two digits */ | |
24 if (a->alloc < 2) { | |
25 if ((res = mp_grow(a, 2)) != MP_OKAY) { | |
26 return res; | |
27 } | |
28 } | |
29 | |
30 /* zero the int */ | |
31 mp_zero (a); | |
32 | |
33 /* read the bytes in */ | |
34 while (c-- > 0) { | |
35 if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) { | |
36 return res; | |
37 } | |
38 | |
39 #ifndef MP_8BIT | |
40 a->dp[0] |= *b++; | |
41 a->used += 1; | |
42 #else | |
43 a->dp[0] = (*b & MP_MASK); | |
44 a->dp[1] |= ((*b++ >> 7U) & 1); | |
45 a->used += 2; | |
46 #endif | |
47 } | |
48 mp_clamp (a); | |
49 return MP_OKAY; | |
50 } | |
51 #endif | |
52 | |
53 /* $Source: /cvs/libtom/libtommath/bn_mp_read_unsigned_bin.c,v $ */ | |
54 /* $Revision: 1.4 $ */ | |
55 /* $Date: 2006/03/31 14:18:44 $ */ |